Nurikabe


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Nurikabe is a logic puzzle with a bit complicated rules and challenging solutions.

The rules are not so simple. :)
You have a grid of squares Some cells of the grid start containing numbers. The goal is to determine whether each of the cells of the grid is "black" or "white" (Islands in the Stream calls these "water" and "land" respectively). The black cells form "the nurikabe" (Islands in the Stream calls it "the stream"): they must all be orthogonally contiguous (form a single polyomino), number-free, and contain no 2x2 or larger solid rectangles (Islands in the Stream calls such illegal blocks "pools"). The white cells form "islands" (which is where Islands in the Stream got its name): each number n must be part of an n-omino composed only of white cells. All white cells must belong to exactly one island; islands must have exactly one numbered cell. Solvers will typically shade in cells they have deduced to be black and dot (non-numbered) cells deduced to be white.
Left click on a square to make it black. Right click to mark with dot. Click and drag to mark more than one square.

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Nurikabe


5x5 Nurikabe Easy | 5x5 Nurikabe Hard | 7x7 Nurikabe Easy | 7x7 Nurikabe Hard | 10x10 Nurikabe Easy | 10x10 Nurikabe Hard | 12x12 Nurikabe Easy | 12x12 Nurikabe Hard | 15x15 Nurikabe Easy | 15x15 Nurikabe Hard | 20x20 Nurikabe Easy

This Month
1. bearn
107
00:22.49
2. NoahR
166
01:00.10
3. Andy100
77
01:04.72
4. stevethesquid
37
01:13.77
5. tiramasu 01:28.30
6. s56squared 01:40.62
7. David Hwang
26
01:40.80
8. chiimo 01:57.04
9. mopon 02:07.37
10. brac37 02:23.53
11. WLF117171711 02:27.17
12. lanshangfaren
20
02:49.16
13. iamMaddie7 03:52.49
14. Michelins
19
04:32.83
15. Chl
13
10:41.21
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This Week
1. bearn
107
00:22.49
2. s56squared 01:40.62
3. chiimo 01:57.04
4. brac37 02:23.53
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Today
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MO3
1. bearn
107
00:24.16
2. sfumato
144
00:26.65
3. Douglas Shamlin Jr.
383
00:32.25
4. mediteran13
54
00:35.13
5. EinsteinsBarber
77
00:46.59
6. numbrr
98
00:51.94
7. qqwref
136
01:00.45
8. arcer
84
01:06.92
9. Tristal
47
01:07.52
10. Fastfaxer
115
01:08.94
AO5
1. bearn
107
00:26.70
2. sfumato
144
00:28.12
3. Douglas Shamlin Jr.
383
00:31.44
4. mediteran13
54
00:42.16
5. EinsteinsBarber
77
00:48.52
6. numbrr
98
00:52.71
7. Tristal
47
01:08.63
8. Fastfaxer
115
01:10.97
9. qqwref
136
01:11.90
10. NoahR
166
01:12.92
AO12
1. bearn
107
00:31.07
2. sfumato
144
00:33.67
3. Douglas Shamlin Jr.
383
00:36.08
4. EinsteinsBarber
77
00:56.39
5. numbrr
98
01:09.67
6. qqwref
136
01:13.03
7. Tristal
47
01:15.54
8. NoahR
166
01:18.75
9. Fastfaxer
115
01:19.37
10. arcer
84
01:24.72
Robots / programmatic solversinfo  
1.Charlie Li
60
00:00.485
2.nbjohnson00:00.735
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* MO3 - Mean of 3. The average of 3 consecutive times.
AO5 - Average of 5. The average of 5 consecutive times ignoring the highest and the lowest.
AO12 - Average of 12. The average of 12 consecutive times ignoring the highest and the lowest.
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2022-05-26 02:45:08

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